Clinches: KC, TOR, NYM, LAD, STL have clinched division titles (LAD to be home team in NLDS vs. NYM; STL to be home team vs. CHC or PIT in NLDS).
CHC and PIT have clinched spots in NL Wild Card Game (home team TBD). NYY has clinched spot in AL Wild Card Game (home team TBD).
TEX has clinched postseason berth. KC and TOR have clinched home-field advantage in ALDS.
Due to the strike in 1981, the season was split into two halves and playoff seedings were determined using the winners from each half. The first half began on April 9 and ended June 11, while the second half started on August 10 and ended October 4. Overall standings are presented here for reference but were not used to determine playoff berths.